Glass-melting receptacle.



S. R. SCHOLES. GLASS MELTING RECEPTACLF.

APPLICATION FILED AUG.3I, 19l4.

1,200,889. Patented Oct. 10,1916.

WITNESSES INVENTOR JMMQ-SM M 250% 6,51 MM 1.2003895 I if I To all whom it meg/"concern Be it known that I, SAMUEL R. SCHOLE'S, residing at Pittsburgh,'in the county of Allegheny and :State of-Pennsylvania, aficit1- zen of the-United States," have invented or discovered certain new and useful Improvements in Glass-Melting Receptacles," of which improvements the following is a specification.

The invention described herein relates to the construction of glass melting receptacles, such as pots, tanks, etc. Such receptacles, and particularly the type of glass pots which inactual'practice have been found to be most desirable, rapidly deteriorate in service, and due to' their deterioration, the

lass being heated is prejudicially afiected.

s usually constructed, such pots are made of a mixture of substantially equal proportions of raw and new'burnt clay and a smaller proportion of ground pot shell, about one per cent. of the mixture being an alkali vitrifying agent present as an impurity in these-materials. When laced in service, the fluxes used in the glass atch, as"

well 'as the molten glass itself, cause the surface of the pot walls to become corroded, takinginto the glass considerable foreign matter such as alumina, the presence of which, imperfectly mixed with the glass, is manifest in ware a's cords or streak. Moreover,this corrosion is not uniform over the surface of the pot wall, but follows the interstices between the. burnt clay or grog of the pot wall mixture, producing a honeycombed appearance of the wall. The less readily corroded burnt clay particles finally become surrounded by the encroaching glass, float into the main body thereof, and are gathered into the ware where they may appear as opaque stones or transparent nodules, visible because of a different refractory .power than the glass proper. To overcome these prejudicial circumstances, it has been suggested that these glass melting receptacles be made of less porous and more vitreous clay than is the usual practice, but

in a thick solid body of burnt clay, such as a glass pot, a certain degree of porosity or structural looseness is necessary to permit of expansion and contraction under the changes of temperature to which such vessels are necessarily subjected. Otherwise the vessels may break, and, in determining their construction the liability of breakage of lessv Specification of Letters Patent.

of more porous vessels. r

The'ob ect of the invention is toprovide tacle. which will not-break or beg-otherwise OFFICE samunnn. sci-rows, or rirr'snunen, rnrmsrnvamaassrenon iron. c. .rn 1z Grass comm, or aocnnsrnn, rnnnsnvanra, a conronarronor rnunsrrgyama. ,i.

detrimental consequence than inza practical form a glass melting recepinjured'by the action ofthe furnace.-heat,

and which will becorroded little if anyby.

the y f molten glass or any; ofit stituents. a I

Wann bee-1o; 1916.1. Application-filedAugiustSLIBM..,Seria1 No.859,446.' 7

1 porous vessels has been considered of greater @the corrosion In the practice-of my'invention I con-z structthe' receptacle walls of two refractory materials, integrally united-to each "other, 1 one forming an outer'body portion and the other an interior lining, over all or such p0r'- the molten glass.

a tion of the interior surface of the body'port1on as would m practice he in contact with The body portionfmay bemadeof: any; I

suitable refractory material of good thermal endurance, that is, which will notcrack or be otherwise injured 'by the wide variation 1 in temperature or the relatively sudden temare subjected in service. Preferably the body portion'is made of clay having such characteristics as I have described, and may be made of the mixture already mentioned as being usually employed in the construction of glass pots.

The inner wall or lining, which is preferably materially thinner than the body portion, is made of a suitable refractory material, but, as distinguished from the outer wall, is ofa vitreous non-porous nature, and, as such, adapted to withstand the corrosive action of the molten glass. The preferred material for the lining is clay having about two per cent. of its mass a vitrifying alkali. In practice I have obtained very satisfactory results with a lining consisting of a mixture of raw clay, burnt clay, pieces of ground potshell and about ten per cent, of its weight of feldspar. It will be understood, however, that other clay mixture, and other vitrifying agents than the alkali of feldspar, may be employed as well as those particularly specified.

In the accompanying drawing, illustrating one embodiment of my invention, there is shown a vertical central sectional view of the usual form of glass pots. In constructing the pot, the lining or inner wall 1 may be applied to the outer wall or body portion 2 in any desired manner. However, to

perature changes to which'such receptacles i lining 1 may, as already stated, cover the entire inner surface of the body 2, but preferably extends but slightly above the surface line of the molten glass 3, as indicated by the dotted line 4.

While my invention "may be practised in various forms of glass melting receptacles, it is particularly applicable to glass pots I wherein the glass is melted by heat applied to the exterior surface of the vessel, rather than directly to the glass, as by a flame in glass tanks, or otherwise by electricity. 1 have found that the heat expansion and contraction of the outer body in no way injures the vitreous lining. In explaining this, my theory, held subject to alteration, is that the relatively thin lining of vitreous refractory material becomes, when heatedto the glass melting temperature, sufiiciently plastic to flow with, rather than be cracked from, the wall to which it is integrally united. At all events I have found that the lining. or inner wall remainsintact and is corroded little if any by the actionof the molten glass.

I claim as my'invention: j

l. A glass melting receptacle comprising do 01 um mm m 1 obtained man outer body portion composed of a mixture of raw clay, raw burnt clay, and ground pot shell; and an interior lining integrally united with the body portion and consisting of a mixture of raw clay, burnt clay, and

feldspar.

\ 2. A glass melting receptacle comprising an outer body portion of refractory clay containing about one per cent. alkali, and an inner lining of refractory clay containing about two per cent. alkall.

3. A glass melting receptacle comprising .an outer body portion constructed of a mixture of raw and burnt clay, and an inner lining integrally united with the body portion and constructed of raw clay, and feldspar.

at. A glass-melting receptacle comprising an outer body portion constructed of a mixture of raw and burnt clay, and an inner lining integrally united with the body portion and constructed of raw clay, burnt clay and a vitrifying agent.

In testimony whereof I have hereunto set my hand.

SAMUEL R. soHoLEs.

lVitnesses:

FRANCIS J. ToMAssoN, LOUIS G. IONATA.

five cent: each. by addressing the "Commissioner 0! Datum. Washington, 8.8."

burnt clay 

